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Unity is an integrated authoring tool for creating 3D video games or other interactive content such as architectural visualizations [2] or real-time 3D animations. Unity's development environment runs on Microsoft Windows and Mac OS X, and the games it produces can be run on Windows, Mac, Xbox 360, PlayStation 3, Wii,[3] iPad, iPhone,[4] as well as the Android platform. It can also produce browser games that use the Unity web player plugin, supported on Mac and Windows but not Linux. The web player is also used for deployment as Mac widgets. Unity also has the ability to export games to Adobe's Stage 3D functionality in Flash, but certain features that the web player supports are not useable due to limitations in Flash.
Unity consists of both an editor[5] for developing/designing content and a game engine[6] for executing the final product. Unity is similar to Director, Blender game engine, Virtools, Torque Game Builder, and Gamestudio, which also use an integrated graphical environment as the primary method of development.
Unity won the Wall Street Journal 2010 Technology Innovation Award in the software category.[7] In 2009, Unity Technologies was named one of Gamasutra's "Top 5 Game Companies of 2009"[8] for Unity. Unity was a runner-up for the best use of graphics on Mac OS X in the 2006 Apple Design Awards.[9]

Integrated development environment with hierarchical, visual editing, detailed property inspectors and live game preview.[10][11]
Deployment on multiple platforms:
As a Microsoft Windows or Mac OS X executable
On the web (via the Unity Web Player plugin for Internet Explorer, Firefox, Safari, Mozilla, Netscape, Opera, Google Chrome and Camino) on Windows and OS X.
As a Mac OS X Dashboard widget
For Nintendo Wii[3] (requires additional license)
As an iPhone/iPad application[4] (requires additional license)
For Google Android[12] (requires additional license)
For Google Chrome Native Client [13]
For Microsoft Xbox 360 (requires additional license)
For Adobe Flash [14]
For Sony PlayStation 3 (requires additional license)
Assets loaded into Unity and are automatically imported, and are re-imported if the asset is updated.[15] Unity supports integration with 3ds Max, Maya, Softimage, Blender, Modo, ZBrush, Cinema 4D, Cheetah3D, Photoshop and Allegorithmic Substance.
Graphics engine uses Direct3D (Windows), OpenGL (Mac, Windows), OpenGL ES (iOS, Android), and proprietary APIs (Wii).[16]
Support for bump mapping, reflection mapping, parallax mapping, Screen Space Ambient Occlusion, dynamic shadows using shadow maps, render-to-texture and full-screen post processing effects.
ShaderLab language for using shaders, supporting both declarative "programming" of the fixed-function pipeline and shader programs written in Cg or GLSL.[17] A shader can include multiple variants and a declarative fallback specification, allowing Unity to detect the best variant for the current video card and if none are compatible, fall back to an alternative shader that may sacrifice features for broader compatibility.
Built-in support for Nvidia's (formerly Ageia's) PhysX physics engine,[18] version 2.8.3 (as of Unity 3.0) with added support for real time cloth on arbitrary and skinned meshes, thick ray casts, and collision layers.
Game scripting via Mono.[19] Scripting is built on Mono, the open-source implementation of the .NET Framework. Programmers can use UnityScript (a custom language with ECMAScript-inspired syntax), C# or Boo (which has a Python-inspired syntax). Starting with the 3.0 release, Unity ships with a customized version of MonoDevelop for debugging scripts.[20]
The Unity Asset Server - A version control solution for all game assets and scripts, using PostgreSql as a backend.
Audio system built on FMOD library, with ability to play back Ogg Vorbis compressed audio.
Video playback using Theora codec.[21]
A terrain and vegetation engine,[22] supporting tree billboarding.
Occlusion Culling with Umbra (only in Unity >= 3 Pro).
Built-in lightmapping and global illumination with Beast (only in Unity >= 3 Pro).
Multiplayer networking using Raknet.
The Unity Asset Store - An in-editor repository with thousands of Unity-ready assets, including models, characters, code, audio, etc.
Built-in Pathfinding. [23]
[edit]Version control with Unity

The Unity Asset Server was a version control solution for all game assets and scripts.[24] It is now superseded by the version control system in Unity 3.5. Import settings and other metadata are stored and versioned while updates, commits, and graphical version comparisons are performed inside the Unity Editor. A shortfall with Unity's built-in version control is its lack of support for branching, tagging, or any DVCS features found in modern systems such as Git or Mercurial.
Unity have recently made it possible to use alternative version control software, so larger, more complex projects can be managed using branches or decentralized workflows.[25]
[edit]Licensing

There are two main licenses: Unity and Unity Pro,[26] with the Pro version being available for a price and the non Pro version being free. The Pro version has additional features, such as render-to-texture, occlusion culling, global lighting and post-processing effects. The Free version, on the other hand, displays a splash screen (in standalone games) and a watermark (in web games) that cannot be customized or disabled.
Both Unity and Unity Pro include the development environment, tutorials, sample projects and content, support via forum, wiki, and future updates in the same major version (i.e. buying Unity Pro 3.0 gets all future Unity Pro 3.x updates for free).
Unity for iOS and Unity for Android are add-ons to an existing Unity purchase.[4] A Unity Pro licenses is required to purchase an iOS Pro or Android Pro licenses. The regular Android and iOS licenses can be used with the free version of Unity.
Source code, PS3, Xbox 360, and Wii licenses are negotiated on a case by case basis.[27]
Educational licenses are provided by Studica with the stipulation that it is for purchase and use by schools, purely for education.[28]
[edit]Future platforms

[edit]Linux
There have been several indications a Linux port is in the works. Specifically, an end-user discovered an option for Linux as a runtime platform in Unity itself[29] and work on a Linux port was later confirmed by a Unity Technologies developer.[30] A prototype of a web-plugin for Firefox on Linux was also blogged about on Unity's corporate blog[31] and another Unity Technologies employee has publicly indicated that work has been done on a Linux port.[32] However, while there has been spare time work done on a Linux port, Unity Technologies have indicated that they don't intend to support Linux unless they see a greater demand for it from their customers who develop games with their engine.[33]
With the upcoming support for Flash,[14] Linux users will be able to play Unity-authored content with a Flash browser plug-in.
[edit]Roku 2
On September 28 it was announced that Unity will provide content for the streaming box top set, Roku 2 through its Union initiative.[34]
[edit]Uses of the engine

PlayUnityGames.com is a portal similar to those found for Flash games, containing hundreds of games built using Unity. [35]
Tiger Woods PGA TOUR Online was built using Unity. [36]
Battlestar Galactica Online is a massively multiplayer online space shooter game built with Unity.